Write the name , colour and solubility of precipitate in excess of NaOH formed when-
1- Zinc Sulphate and
2- Ferric Chloride reacts sodium hydroxide

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Solution

Zinc Sulphate
When sodium hydroxide solution is added drop by drop to zinc sulphate solution a white precipitate is formed which is soluble in excess of sodium hydroxide.
ZnSO₄ + 2NaOH → Zn(OH)₂ + Na₂SO₄
Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O

Ferric Chloride
chloride reacts with sodium hydroxide to form iron(III) hydroxide and sodium chloride.

The balanced equation for the reaction between FeCl3 and NaOH is FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl. Since iron(III) chloride and sodium chloride are soluble in water, but not iron(III) hydroxide, the reaction causes a solid to be precipitated. As iron(III) hydroxide is brown, a brown precipitate is formed. Hence, this is known as a precipitation reaction.

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Q. Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).

Aqueous salt Solution	Colour of precipitate when NaOH is added in a small quantity	Nature of precipitate (soluble or insoluble) when NaOH is added in excess
Copper (II) sulphate Zinc nitrate Lead nitrate Calcium chloride Iron (III) sulphate	(i) (ii) (iii) (iv) (v)	(vi) (vii) (viii) (ix) (x)

Aqueous salt solution	Colour of precipitate when NaOH is added in a small quantity.	Nature of precipitate (soluble or insoluble) when NaOH is added in excess.
Copper(II) sulphate Zinc nitrate Lead nitrate Calcium chloride Iron(III) sulphate	(i) (ii) (iii) (iv) (v)	(vi) (vii) (viii) (ix) (x)

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Write the name , colour and solubility of precipitate in excess of NaOH formed when- 1- Zinc Sulphate and 2- Ferric Chloride reacts sodium hydroxide

Write the name , colour and solubility of precipitate in excess of NaOH formed when-
1- Zinc Sulphate and
2- Ferric Chloride reacts sodium hydroxide